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Clickable map of Colorado area codes in blue (with bordering states). [1] The U.S. state of Colorado is served by five telephone area codes of the North American Numbering Plan (NANP). Area code 303 is the original area code assigned to the entire state when the first nationwide telephone numbering plan was created in 1947.
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The map to the right is now clickable; click on an area code to go to the page for that code, or use the text links below. Map of Colorado area codes in blue (with border states) Pages in category "Area codes in Colorado"
Area codes 918 and 539 are telephone area codes serving Tulsa and northeast Oklahoma. Besides Tulsa, these area codes cover cities such as Bartlesville, Broken Arrow, Claremore, Gore, Jenks, McAlester, Muskogee, Okmulgee, Pryor, Sapulpa, Tahlequah, and northeastern Oklahoma. Area code 918 was created in 1953 as a split from area code 405.
The northeastern and western portions of area code 303, including Fort Collins, Grand Junction, Vail and Aspen, were separated on April 2, 1995, and became area code 970. This split reduced 303 to the Denver-Boulder area. [3] With the 1995 split, 303 was the only Colorado area code that did not border another state.
prior to 1991, was the area code for Mexico City; split of 416; 2001: overlaid by 289; 2013: overlaid by 365; 2021: overlaid by 742 [8] 537 reserved as a fifth area code for the region. 906: Michigan (Upper Peninsula: Sault Ste. Marie, Escanaba, Houghton, Iron Mountain, Marquette, Menominee, etc.) March 19, 1961: split of 616; 907
It was created in a split of area code 303 on March 5, 1988. [2] While 303 had been Colorado's sole area code for 40 years, the state's explosive growth in the second half of the 20th century made it apparent that the state would need another area code. 719 was split off when an impending number shortage meant the split could no longer be ...
The other three area codes serving Oklahoma are 918 and 539, which cover northeastern Oklahoma (including the city of Tulsa); and 580, which serves western and southern Oklahoma. Area code 405 was one of the original area codes put into service in 1947 by telecom giant AT&T. Until January 1, 1953, it covered the entire state of Oklahoma.